{
  "cveId": "CVE-2025-53901",
  "url": "https://patchblox.com/security/cve/CVE-2025-53901",
  "summary": "CVE-2025-53901 is fixed in rust-wasmtime on 1 platform by DEBIAN-CVE-2025-53901 (version 36.0.5\u002Bdfsg-1), released July 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "rust-wasmtime: Wasmtime is a runtime for WebAssembly",
  "description": "Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.4, 33.0.2, and 34.0.2, a bug in Wasmtime\u0027s implementation of the WASIp1 set of import functions can lead to a WebAssembly guest inducing a panic in the host (embedder). The specific bug is triggered by calling \u0060path_open\u0060 after calling \u0060fd_renumber\u0060 with either two equal argument values or a second argument being equal to a previously-closed file descriptor number value. The corrupt state introduced in \u0060fd_renumber\u0060 will lead to the subsequent opening of a file descriptor to panic. This panic cannot introduce memory unsafety or allow WebAssembly to break outside of its sandbox, however. There is no possible heap corruption or memory unsafety from this panic. This bug is in the implementation of Wasmtime\u0027s \u0060wasmtime-wasi\u0060 crate which provides an implementation of WASIp1. The bug requires a specially crafted call to \u0060fd_renumber\u0060 in addition to the ability to open a subsequent file descriptor. Opening a second file descriptor is only possible when a preopened directory was provided to the guest, and this is common amongst embeddings. A panic in the host is considered a denial-of-service vector for WebAssembly embedders and is thus a security issue in Wasmtime. This bug does not affect WASIp2 and embedders using components. In accordance with Wasmtime\u0027s release process, patch releases are available as 24.0.4, 33.0.2, and 34.0.2. Users of other release of Wasmtime are recommended to move to a supported release of Wasmtime. Embedders who are using components or are not providing guest access to create more file descriptors (e.g. via a preopened filesystem directory) are not affected by this issue. Otherwise, there is no workaround at this time, and affected embeddings are recommended to update to a patched version which will not cause a panic in the host.",
  "published": "2025-07-18T18:15:24Z",
  "severity": "low",
  "cvss": 3.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L",
  "epss": 0.00381,
  "epssPercentile": 0.32324,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "rust-wasmtime",
      "release": "Debian 14",
      "fixedVersion": "36.0.5\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2025-53901",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-53901",
      "released": "2025-07-18T18:15:24Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}